Comparison

GriGri3D Stereogram vs PowerTread

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

GriGri3D Stereogram

Explore hidden 3D objects within stereograms using intuitive touch controls for rotation and scaling. This app also offers a parallel view method to help relax tired eyes. Customize view methods, depth, and patterns in real-time with a collection of beautiful patterns and 3D models.

Highlights
  • Interactive 3D object viewing
  • One-finger rotation
  • Pinch-to-scale functionality
  • Parallel view for eye relaxation
  • Real-time customization of view settings
  • Collection of 30+ patterns and 3D models
Features
Read full description

Have you ever want to touch the hidden objects when you view stereogram? This app grant the wish just a little bit. Rotation with one finger, scaling with pinch. It moves like touching with your finger. View it with the rotation and size you like. .:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:. Also to relax tired eyes. The Parallel view method helps relieve the muscles of the eyes. .:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:. Adjust parallel/cross view method, depth, background pattern, and distance of dots in realtime .:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:. 30+2 Carefully selected beautiful patterns and 3D models .:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:. This is a app to view 3D images called the single-image stereogram, autostereogram or magic eye. You can see the stereoscopic images with the naked eye without using special goggles or glasses. See the screen with a gaze like looking far ( Parallel View Method ) or with crossed eyes ( Cross View Method ). The way to view is explained in detail in the app. .:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:. It moves smoothly with 60* images per second. * iPhone 5, iPad 4th or later .:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:. Youtube: https://youtu.be/ciIHGPj48g4 .:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:. "GriGri" means to turn and turn it in various directions in Japanese. Let's GriGri! .:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:..:.:.:. - Striving for the most beautiful single image stereogram - 2017 Masataka Hakozaki

About

PowerTread

Simulate real-world terrain and power-based running on your treadmill. This app offers structured workouts, automatic incline control, and performance tracking to prepare you for races. Sync your data with Apple Health for comprehensive training insights.

Highlights
  • GPX course simulation
  • Automatic incline control
  • Power-based running metrics
  • Structured interval workouts
  • Apple Health integration
  • FTMS-compatible treadmill support
Features
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PowerTread — Real-world treadmill training for serious runners. Turn indoor running into terrain-based, power-driven race preparation. PowerTread enhances your treadmill workouts with GPX course simulation, structured interval support, automatic incline control, and integrated power tracking. Prepare for real races while training indoors. Real-World Treadmill Simulation • Load GPX routes and simulate real outdoor courses • Experience climbs and descents automatically on FTMS-compatible treadmills • Match pacing and effort to real terrain Power-Based Running Indoors • Automatic incline-adjusted running power • Train by effort, not just speed • Track performance for focused race preparation Structured Workouts + Course Execution • Run intervals and structured workouts during terrain simulation • Combine course profiles with workout targets • Stay focused on effort and pacing Sync & Health Integration • Import and organize workouts and routes • Export completed runs to supported training platforms • Save workout data and performance metrics to Apple Health Smart Compatibility • Works with FTMS-compatible treadmills • Supports Bluetooth performance sensors • Automates incline while keeping you in control Built for Focused Training PowerTread is a treadmill training app built for runners who want indoor sessions to reflect real-world effort. Whether preparing for a race, improving running power, or staying consistent between outdoor runs, PowerTread helps you train with purpose. Free + Pro Features Free • Sample courses • Sample workouts • Passive mode — records incline and adjusts running power while you control the treadmill PowerTread Pro (one-time unlock) • Import unlimited GPX routes • Retrieve scheduled workouts • Retrieve saved routes • Expanded course and workout library No subscriptions. No recurring fees.

Screenshots

GriGri3D Stereogram4 screens
PowerTread4 screens

Verdict

The call

The clearest difference is price: PowerTread at Free against GriGri3D Stereogram's $2.99. PowerTread also leads on rating (5.0 vs 4.5) and review sentiment (100% vs 87%). GriGri3D Stereogram's advantage is in-app purchases (none vs 1) and ratings volume (12 vs 2). On ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

PowerTread is free to download; GriGri3D Stereogram costs $2.99 up front. PowerTread sells 1 one-off in-app purchase. GriGri3D Stereogram asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

PowerTread holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: GriGri3D Stereogram has 12 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 87% of GriGri3D Stereogram's written reviews are positive against 100% of PowerTread's.

Scorecard7 real differences · 3 level
GriGri3D Stereogram versus PowerTread: the parameters behind the verdict, then further details
ParameterGriGri3D StereogramPowerTread
Price$2.99Free — better
Rating4.5 (12 ratings)5.0 (2 ratings) — better
Positive reviews86.7% of reviews100.0% of reviews — better
Number of ratings12 — better2
Update frequency—Every 3 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS9.1 — better18.6
Further details — not scored
Size62 MB45 MB
Age rating4+4+
DeveloperMasataka HakozakiNoVa Solutions Group, LLC

Customer experience

GriGri3D Stereogram

All ratings12 ratings
Positive91.7%
Neutral0.0%
Negative8.3%
Written reviews15 reviews
Positive86.7%
Neutral0.0%
Negative13.3%

PowerTread

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

GriGri3D Stereogram

No in-app purchases

1 purchases

PowerTread

One-time1
  • PowerTread Pro$24.99

Questions

Is GriGri3D Stereogram free?
GriGri3D Stereogram costs $2.99, with no in-app purchases.
Is PowerTread free?
PowerTread is free to download, with in-app purchases available.
Which has better reviews, GriGri3D Stereogram or PowerTread?
PowerTread is rated higher. GriGri3D Stereogram averages 4.5 out of 5 from 12 ratings, while PowerTread averages 5.0 from 2 ratings.
Do GriGri3D Stereogram or PowerTread have ads?
Neither GriGri3D Stereogram nor PowerTread shows ads.

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